Personally I'd like to spend my time and money on "MegaMig".
A new PCB to build on MiniMig.
128 Mbytes of SDRAM
060 @ 100MHz
24-bit video DAC
Bigger FPGA
802.11n WiFi (Maybe 802.11b Prism chipset for existing drivers?)
Unfortunately I dont have any money, I dont have any experience with PCB design, and I dont have any time